For tourists on a tight budget, the Southwest Low Fare Calendar is revolutionary. Simply choose the cities of departure and arrival, and the calendar will show you the cheapest flights by day, making it very simple to locate the best offers. I recently used this tool to book a round-trip ticket to Denver for less than $100. The procedure was stress-free, transparent, and swift. I liked how Southwest offers amazing value with two complimentary checked baggage and no change costs. I was able to save time and money by organizing my trip around the most economical days thanks to the calendar. I now always use it when I travel with Southwest.